Mario VS. Rocky

I was a referee in Mike Tyson's Punch-Out and I'm a former boxer as well.
I fought Rocky Balboa three decades ago and people expected me to fail.
He nearly beat my head in until Round 3 when Luigi tossed me a mushroom.
When I ate it, I turned twice as big and the Italian Stallion was doomed.
I beat Balboa so hard that he pissed his trunks and begged for his life.
To add insult to injury, Princess Peach and I had a threesome with his wife.
Sadly, I got Adrian pregnant and the bitch took me to court.
I'm the father of her daughter and I had to pay child support.
Rocky found out that Adrian was a tramp and it caused him a lot of grief.
When she died in 2002, he was rid of her and it brought him a lot of relief.
I beat Rocky after landing blow after blow.
I knocked him on his ass and I won by TKO.